package com.eascs.web.captcha.controller;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.awt.image.BufferedImageOp;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import org.springframework.stereotype.Service;

import com.eascs.site.session.SessionSpec;
import com.eascs.web.captcha.patchca.background.BackgroundFactory;
import com.eascs.web.captcha.patchca.color.ColorFactory;
import com.eascs.web.captcha.patchca.color.RandomColorFactory;
import com.eascs.web.captcha.patchca.filter.ConfigurableFilterFactory;
import com.eascs.web.captcha.patchca.filter.library.AbstractImageOp;
import com.eascs.web.captcha.patchca.filter.library.WobbleImageOp;
import com.eascs.web.captcha.patchca.font.RandomFontFactory;
import com.eascs.web.captcha.patchca.service.Captcha;
import com.eascs.web.captcha.patchca.service.ConfigurableCaptchaService;
import com.eascs.web.captcha.patchca.text.renderer.BestFitTextRenderer;
import com.eascs.web.captcha.patchca.text.renderer.TextRenderer;
import com.eascs.web.captcha.patchca.word.RandomWordFactory;

@Service
public class CaptchaBuilder {
	public static final SessionSpec<String> SESSION_CAPTCHA = new SessionSpec<>("captcha");

	private ConfigurableCaptchaService configurableCaptchaService = null;
	private ColorFactory colorFactory = null;
	private RandomFontFactory fontFactory = null;
	private RandomWordFactory wordFactory = null;
	private TextRenderer textRenderer = null;

	public CaptchaBuilder() {
		configurableCaptchaService = new ConfigurableCaptchaService();

		// 颜色创建工厂,使用一定范围内的随机色
		colorFactory = new RandomColorFactory();
		configurableCaptchaService.setColorFactory(colorFactory);

		// 随机字体生成器
		fontFactory = new RandomFontFactory();
		fontFactory.setMaxSize(32);
		fontFactory.setMinSize(28);

		configurableCaptchaService.setFontFactory(fontFactory);

		// 随机字符生成器,去除掉容易混淆的字母和数字,如o和0等
		wordFactory = new RandomWordFactory();
		wordFactory.setCharacters("abcdefghkmnpqstwxyz23456789");
		wordFactory.setMaxLength(5);
		wordFactory.setMinLength(4);

		configurableCaptchaService.setWordFactory(wordFactory);

		// 自定义验证码图片背景

		MyCustomBackgroundFactory backgroundFactory = new MyCustomBackgroundFactory();
		configurableCaptchaService.setBackgroundFactory(backgroundFactory);

		// 图片滤镜设置
		ConfigurableFilterFactory filterFactory = new ConfigurableFilterFactory();
		List<BufferedImageOp> filters = new ArrayList<BufferedImageOp>();
		WobbleImageOp wobbleImageOp = new WobbleImageOp();
		wobbleImageOp.setEdgeMode(AbstractImageOp.EDGE_MIRROR);
		wobbleImageOp.setxAmplitude(2.0);
		wobbleImageOp.setyAmplitude(1.0);
		filters.add(wobbleImageOp);

		filterFactory.setFilters(filters);
		configurableCaptchaService.setFilterFactory(filterFactory);

		// 文字渲染器设置
		textRenderer = new BestFitTextRenderer();
		textRenderer.setBottomMargin(3);
		textRenderer.setTopMargin(3);
		configurableCaptchaService.setTextRenderer(textRenderer);

		// 验证码图片的大小
		configurableCaptchaService.setWidth(82);
		configurableCaptchaService.setHeight(32);
	}

	public Captcha buildCaptcha() {
		return configurableCaptchaService.getCaptcha();
	}

	public static boolean verify(String inputCaptcha) {
		if (inputCaptcha != null && inputCaptcha.equalsIgnoreCase(CaptchaBuilder.SESSION_CAPTCHA.getValue())) {
			CaptchaBuilder.SESSION_CAPTCHA.remove();
			return true;
		}
		CaptchaBuilder.SESSION_CAPTCHA.remove();
		return false;
	}

	/**
	 * 
	 * 自定义验证码图片背景,主要画一些噪点和干扰线
	 * 
	 */
	static private class MyCustomBackgroundFactory implements BackgroundFactory {

		private Random random = new Random();

		@Override
		public void fillBackground(BufferedImage image) {

			Graphics graphics = image.getGraphics();

			// 验证码图片的宽高

			int imgWidth = image.getWidth();

			int imgHeight = image.getHeight();

			// 填充为白色背景

			graphics.setColor(Color.WHITE);

			graphics.fillRect(0, 0, imgWidth, imgHeight);

			// 画100个噪点(颜色及位置随机)

			for (int i = 0; i < 100; i++) {

				// 随机颜色

				int rInt = random.nextInt(255);

				int gInt = random.nextInt(255);

				int bInt = random.nextInt(255);

				graphics.setColor(new Color(rInt, gInt, bInt));

				// 随机位置

				int xInt = random.nextInt(imgWidth - 3);

				int yInt = random.nextInt(imgHeight - 2);

				// 随机旋转角度

				int sAngleInt = random.nextInt(360);

				int eAngleInt = random.nextInt(360);

				// 随机大小

				int wInt = random.nextInt(6);

				int hInt = random.nextInt(6);

				graphics.fillArc(xInt, yInt, wInt, hInt, sAngleInt, eAngleInt);

				// 画5条干扰线

				if (i % 20 == 0) {

					int xInt2 = random.nextInt(imgWidth);

					int yInt2 = random.nextInt(imgHeight);

					graphics.drawLine(xInt, yInt, xInt2, yInt2);

				}

			}

		}
	}

}
